Omron C200HE-CPU11 Installation Manual page 236

PROM
PROM Writer
Proximity Switch
Rack PC
RAM
register/registered
Remote I/O Unit
ROM
switching capacity
stepping motor
switch
system configuration
Unit
watchdog timer
word
work bits
224
Glossary
gramming devices, such as Programming Consoles, and there are non-dedi-
cated programming devices, such as a host computer.
[P(rogrammable) R(ead) O(nly) M(emory)] A type of ROM into which the pro-
gram or data may be written after manufacture, by a customer, but which is fixed
from that time on.
A PROM Writer is a device used to write data to ROM, PROM, and EPROM stor-
age chips.
A switch that uses magnetic induction to measure the distance of a metallic ob-
ject from the front of the switch.
A PC that is composed of Units mounted to one or more Racks. This configura-
tion is the most flexible, and most large PCs are Rack PCs. A Rack PC is the
opposite of a Package-type PC, which has all of the basic I/O, storage, and con-
trol functions built into a single package.
[R(andom) A(ccess) M(emory)] RAM will not retain data when power is discon-
nected. Therefore data should not be stored in RAM.
Storing text and graphics in the RAM/ROM card from a personal computer or the
ASCII Unit. Graphics that have been written to the RAM/ROM card are referred
to as registered messages.
A Unit that extends the distance an Expansion I/O Unit can be from the CPU Unit.
[R(ead) O(nly) M(emory)] A type of digital storage that cannot be written to. A
ROM chip is manufactured with its program or data already stored in it, and it can
never be changed. However, the program or data can be read as many times as
desired.
The voltage/current that relay can switch ON and OFF.
An output device that rotates according to signals from the Control System. The
rotation is very precise and occurs in pre-defined "steps."
An input device that sends either an ON or OFF signal to the Control System. A
switch can be operated either by a person or by the movement of a piece of
equipment or material.
The arrangement in which Units in a System are connected. This term refers to
the conceptual arrangement and wiring together of all the devices needed to
comprise the System. In OMRON terminology, system configuration is used to
describe the arrangement and connection of the Units comprising a Control Sys-
tem that includes one or more PCs.
In OMRON PC terminology, the word Unit is capitalized to indicate any product
sold for a PC System. though most of the names of these products end with the
word Unit, not all do, e.g., a Remote Terminal is referred to in a collective sense
as a Unit. Context generally makes any limitations of this word clear.
A special timer inside the CPU Unit that monitors the PC's cycle time. The watch-
dog timer sets a flag if the cycle time becomes longer than a certain specified
value. This is useful if the correct operation of your System depends on a certain
maximum cycle time.
In digital circuits, a group of bits. Usually a word consists of four, eight, or sixteen
bits. In C-series PCs, a word consists of sixteen bits. Words can be used to store
data, or they can be used for I/O.
Bits in the IR area that are not being used for input or output. These bits can be
used in the program in any way desired.